[Collins] PM-2 supply question

[wabate]

The Collins literature I have list the PM-2 as a lightweight supply.  In 
the specs, the high voltage spec is 'key down intermittent'.  Beyond 
that I can't find any info.  Was there an on/off spec for key down? 
Obviously, cw and SSB were considered intermittent.  I can probably rule 
out RTTY but how abort speech processing for SSB?  Is there a 
temperature rise spec for the transformer?

Thanks,

Bill, K3PGB